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mm: tlb: mtl: Add support for changing mapped region flags

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Added sys_mm_drv_update_page_flags function that allows to change access
flags to a already mapped memory region.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>
This commit is contained in:
Adrian Warecki 2024-01-23 17:22:42 +01:00 committed by Alberto Escolar
parent ac8920e342
commit 46f3d78983
1 changed files with 43 additions and 0 deletions
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43
drivers/mm/mm_drv_intel_adsp_mtl_tlb.c
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@ -401,6 +401,49 @@ int sys_mm_drv_unmap_region(void *virt, size_t size)
return sys_mm_drv_simple_unmap_region(va, size);
}
int sys_mm_drv_update_page_flags(void *virt, uint32_t flags)
{
k_spinlock_key_t key;
uint32_t entry_idx;
uint16_t entry;
uint16_t *tlb_entries = UINT_TO_POINTER(TLB_BASE);
int ret = 0;
/* Use cached virtual address */
uintptr_t va = POINTER_TO_UINT(sys_cache_cached_ptr_get(virt));
/* Make sure inputs are page-aligned and check bounds of virtual address space */
CHECKIF(!sys_mm_drv_is_addr_aligned(va) ||
(va < UNUSED_L2_START_ALIGNED) ||
(va >= (CONFIG_KERNEL_VM_BASE + CONFIG_KERNEL_VM_SIZE))) {
return -EINVAL;
}
key = k_spin_lock(&tlb_lock);
entry_idx = get_tlb_entry_idx(va);
entry = tlb_entries[entry_idx];
/* Check entry is already mapped */
if (!(entry & TLB_ENABLE_BIT)) {
ret = -EFAULT;
goto out;
}
/* Clear the access flags */
entry &= ~(TLB_EXEC_BIT | TLB_WRITE_BIT);
/* Set new permissions for this entry */
entry |= flags_to_tlb_perms(flags);
tlb_entries[entry_idx] = entry;
out:
k_spin_unlock(&tlb_lock, key);
return ret;
}
int sys_mm_drv_page_phys_get(void *virt, uintptr_t *phys)
{
uint16_t *tlb_entries = UINT_TO_POINTER(TLB_BASE);